Sally,
With regard to question 1, I am not sure whether the CAA officially publish results, in term of the companies who trained the students, however, there is a list of 'approved' schools that are validated to conduct these courses. Obviously, the schools will have to meet certain criteria in order to run these courses.
With respect to the quality of OATS, I am reluctant to comment because I have not trained there, however I have been there on a number of occasions and know a couple of people who work there, and it seems like a reasonable establishment. However, as you probably have read, through the search facility, OATS appear to have their good and bad points like any school, and I think it is just a question of going along and seeing what
you think. Alot of people seem to get caught up in the prestige element, however, I don't want to start arguments amongst people

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Cheers